- Blood draws: Blood samples will be collected in order to measure antibodies against a panel of HPV types, including HPV 16 and 18. Blood samples will be sent to the laboratory for Applied Molecular Biology (LAMB/LBMA) located in Bamako, for centrifugation and serum aliquoting. The serum samples will be stored at -20°C and will be sent to the United States every four months for serological testing in the Merck laboratories.